'If I can find that out in 30 seconds, why didn't the Australian Government?'

Rory Callinan and Marissa Calligeros

Two days after his son was electrocuted stapling foil insulation in a roof cavity as part of the federal government's stimulus program, Kevin Fuller started searching for answers online.

''I punched in foil, electricity and staples and you know what came up? Two or three deaths in New Zealand,'' he told the Royal Commission into the Home Insulation Program on Friday. ''If I can find that out in 30 seconds, why didn't the Australian government?''

In just two sentences, Mr Fuller, whose son was the first installer to die, had neatly summed up much of what the commission into the Rudd government's failed Home Insulation Program (HIP) had so far uncovered.

In some ways it was little surprise, as the 60-year-old logistics manager had played a major role in lobbying for the commission and had spent nearly every day watching its proceedings from the public gallery.

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On Friday, he and Sonny Barnes, sister of 16-year-old Rueben Barnes, who was electrocuted in November 2009, finally got the chance to try to explain the devastating impacts of the insulation program and who they blamed.

Mr Fuller said his son was ''cannon fodder'' for the insulation program and he and his wife would ''never forget what it did to our family''.

He revealed Matthew had been their only child - greatly loved after their first son was stillborn.

Mr Fuller told of trying to contact ''everyone'' after his son's death to try to get the program stopped.